基于双粘本构模型的汽车磁流变液减振器阻尼特性分析

Analytical study on performances of automotive MR shock absorbers employing biviscous constitutive model

将磁流变液在环形阻尼通道的流动简化为无限宽平板间的准稳态流动,建立了磁流变液平板准静态流动方程,利用磁流变液的双粘本构模型、边界条件和相容条件,得出了磁流变液速度分布,并分析了不同粘度比对磁流变液的流动速度分布的影响,在给定活塞速度和环形通道的几何尺寸条件下,对汽车磁流变减振器的阻尼特性进行理论预测,并研究了磁流变液减振器的双粘阻尼特性。按照长安之星微型汽车前悬架的技术要求,设计和制作了微型汽车磁流变减振器,在山川减振器公司对此进行了台架试验研究,试验结果表明应用所提出的理论分析模型和设计原理是可行的。

In this paper, based on the Navier-Stokes equations in hydrodynamics, quasi-static flow governing equations for magnetorheological （MR） fluids in plates channel are theoretically set up by analyzing force equilibrium on fluid element and making several rational simplifications. A Biviscous constitutive model are presented to depict theological behaviors of MR fluids. All flow boundary conditions and flow compatibilities conditions are established on the basis of hydrodynamics. Analytical velocity profiles of MR fluids though the plates channels are obtained via solution of the quasi-static flow equations using Biviscous constitutive model. The formula used to calculate damping force offered MR fluid shock absorbers is formulated using analytical methodology presented in this paper and damping performances are predicated in order to determine design parameters. In the light of technical requirements for front suspension for Changan mini-automobile, MR fluid shock absorbers are designed and fabricated in Chongqing University. Measurements from sinusoidal displacement cycle by ShanChuan Shock Absorber Ltd. eveal that the analysis methodology and design theory are reasonable.